Detection of multiple articles

  • US 5,519,381 A
  • Filed: 11/18/1993
  • Issued: 05/21/1996
  • Est. Priority Date: 11/18/1992
  • Status: Expired due to Term
First Claim
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1. An identification system comprising an interrogator and a plurality of transponders, wherein:

  • the interrogator comprises transmitter means for transmitting at least two independent interrogation signals to the transponders simultaneously, each independent interrogation signal being adapted to independently activate any one or more transponders receiving said signal, receiver means for receiving response signals from the transponders in response to any one or more of the independent interrogation signals transmitted by said transmitter means, and processor means for identifying the transponders from data in the response signals; and

    each transponder comprises receiving means, a code generator, and transmitting means connected to the code generator, so that on receipt of any one or more of the independent interrogation signals transmitted by said transmitter means the transponder transmits a response signal containing data which identifies the transponder.

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